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    <title>Document</title>
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<script>
    // 数组的首尾两个元素互换
    var arr = ["鹿晗","王俊凯","蔡徐坤","彭于晏","周杰伦","刘德华","赵本山"];

    // 交换首位
    let temp = arr[0];
    arr[0] = arr[arr.length - 1];
    arr[arr.length - 1] = temp;

    console.log(arr);
</script>
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